Consider three LANs interconnected by two routers, as in Figure 1. (a) Assign IP
ID: 3833655 • Letter: C
Question
Consider three LANs interconnected by two routers, as in Figure 1. (a) Assign IP addresses to all of the interfaces. For Subnet 1 use addresses of the form 192.168.1.*, for Subnet 2 use addresses of the form 192.168.2.*, and for Subnet 3 use addresses of the form 192.168.3.*. (b) Assign MAC addresses to all of the adapters (d) Suppose the router between Subnets 1 and 2 is replaced with a switch S1, and label the router between Subnets 2 and 3 as R1. Also suppose that now the ARP tables are not up to date. Will E perform an ARP query to find B's MAC address? Why? In the Ethernet frame (containing the IP packet destined to B), that is delivered to router R1, what are the source and destination MAC addresses?Explanation / Answer
a)
You can assign any IP address in the given series. For example,
A's IP address = 192.168.1.2
B's IP address = 192.168.1.3
C's IP address = 192.168.2.2
D's IP address = 192.168.2.3
E's IP address = 192.168.3.2
F's IP address = 192.168.3.3
b)
You can assign any MAC address you want.
c)
NO, E wont perform an ARP query because they are not on the same LAN.
E can find this out by checking B’s IP address.
Ethernet frame from E to R1:
Source IP = E’s IP address
Destination IP = B’s IP address
Source MAC = E’s MAC address
Destination MAC = The MAC address of R1’s interface connecting to Subnet 3.